// model that works with Yahoo Search API
dojo.declare("dojox.grid.data.yahooSearch", dojox.grid.data.dynamic, 
	function(inFields, inData, inSearchNode) {
		this.rowsPerPage = 20;
		this.searchNode = inSearchNode;
		this.fieldNames = [];
		for (var i=0, f; (f=inFields[i]); i++)
			this.fieldNames.push(f.name);
	}, {
	// server send / receive
	encodeParam: function(inName, inValue) {
		return dojo.string.substitute('&${0}=${1}', [inName, inValue]);
	},
	getQuery: function() {
		return dojo.byId(this.searchNode).value.replace(/ /g, '+');
	},
	getParams: function(inParams) {
		var url = this.url;
		url += '?appid=foo';
		inParams = inParams || {};
		inParams.output = 'json';
		inParams.results = this.rowsPerPage;
		inParams.query = this.getQuery();
		for (var i in inParams)
			if (inParams[i] != undefined)
				url += this.encodeParam(i, inParams[i]);
		return url;
	},
	send: function(inAsync, inParams, inOnReceive, inOnError) {
		var
			p = this.getParams(inParams),
			d = dojo.xhrPost({
				url: "support/proxy.php",
				content: {url: p },
				contentType: "application/x-www-form-urlencoded; charset=utf-8",
				handleAs: 'json-comment-filtered',
				sync: !inAsync
			});
			d.addCallbacks(dojo.hitch(this, "receive", inOnReceive, inOnError), dojo.hitch(this, "error", inOnError));
		this.onSend(inParams);
		return d;
	},
	receive: function(inOnReceive, inOnError, inData) {
		try {
			inData = inData.ResultSet;
			inOnReceive(inData);
			this.onReceive(inData);
		} catch(e) {
			if (inOnError)
				inOnError(inData);
		}
	},
	error: function(inOnError, inErr) {
		var m = 'io error: ' + inErr.message;
		alert(m);
		if (inOnError)
			inOnError(m);
	},
	fetchRowCount: function(inCallback) {
		this.send(true, inCallback );
	},
	// request data 
	requestRows: function(inRowIndex, inCount)	{
		inRowIndex = (inRowIndex == undefined ? 0 : inRowIndex);
		var params = { 
			start: inRowIndex + 1
		}
		this.send(true, params, dojo.hitch(this, this.processRows));
	},
	// server callbacks
	processRows: function(inData) {
		for (var i=0, l=inData.totalResultsReturned, s=inData.firstResultPosition; i<l; i++) {
			this.setRow(inData.Result[i], s - 1 + i);
		}
		// yahoo says 1000 is max results to return
		var c = Math.min(1000, inData.totalResultsAvailable);
		if (this.count != c) {
			this.setRowCount(c);
			this.allChange();
			this.onInitializeData(inData);
		}
	},
	getDatum: function(inRowIndex, inColIndex) {
		var row = this.getRow(inRowIndex);
		var field = this.fields.get(inColIndex);
		return (inColIndex == undefined ? row : (row ? row[field.name] : field.na));
	},
	// events
	onInitializeData: function() {
	},
	onSend: function() {
	},
	onReceive: function() {
	}
});

// report
modelChange = function() {
	var n = dojo.byId('rowCount');
	if (n)
		n.innerHTML = dojo.string.substitute('about ${0} row(s)', [model.count]);
}


// some data formatters
getCellData = function(inCell, inRowIndex, inField) {
	var m = inCell.grid.model;
	return m.getDatum(inRowIndex, inField);
}

formatLink = function(inData, inRowIndex) {
	if (!inData)
		return '&nbsp;';
	var text = getCellData(this, inRowIndex, this.extraField);
	return dojo.string.substitute('<a target="_blank" href="${href}">${text}</a>', {href: inData, text: text });
};

formatImage = function(inData, inRowIndex) {
	if (!inData)
		return '&nbsp;';
	var info = getCellData(this, inRowIndex, this.extraField);
	var o = {
		href: inData, 
		src: info.Url,
		width: info.Width,
		height: info.Height
	}
	return dojo.string.substitute('<a href="${href}" target="_blank"><img border=0 src="${src}" width="${width}" height="${height}"></a>', o);
};

formatDate = function(inDatum, inRowIndex) {
	if (!inDatum)
		return '&nbsp;';
	var d = new Date(inDatum * 1000);
	return dojo.string.substitute("${0}/${1}/${2}",[d.getMonth()+1, d.getDate(), d.getFullYear()])
};

formatDimensions = function(inData, inRowIndex) {
	if (!inData)
		return '&nbsp;';
	var w = inData, h = getCellData(this, inRowIndex, this.extraField);
	return w + ' x ' + h;
}
